21502046 has 4 divisors (see below), whose sum is σ = 32253072. Its totient is φ = 10751022.

The previous prime is 21502037. The next prime is 21502051. The reversal of 21502046 is 64020512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21502046² = 924675964372232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375510 + ... + 5375513.

It is an arithmetic number, because the mean of its divisors is an integer number (8063268).

Almost surely, 2^21502046 is an apocalyptic number.

21502046 is a deficient number, since it is larger than the sum of its proper divisors (10751026).

21502046 is a wasteful number, since it uses less digits than its factorization.

21502046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10751025.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21502046 is about 4637.0298683532. The cubic root of 21502046 is about 278.0737085232.

Adding to 21502046 its reverse (64020512), we get a palindrome (85522558).

The spelling of 21502046 in words is "twenty-one million, five hundred two thousand, forty-six".